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1 definition by Reuel Tidhar

 
1.
Gay slang for having sex while sitting on a penis. A man who likes to "sit in the grass" is one who likes to be penetrated while sitting on his partner's penis. The "grass" in the idiom is pubic hair.
"Last find I finally fucked her brother; he likes to sit in the grass."
by Reuel Tidhar July 26, 2008